[richardda1st (Richard)]

Originally Posted by qld

go for the 2inch its got a bigger image and i suggest that you change the colour of the round centre marker on your primary from a white one to a orange coloured one as it will be easier to see the multiple reflections and make them merge into one "donut" .the amount of adjustment to achieve this one donut is very little and bobs knobs are a big aid.

I assume you use the 2" yourself. If you don't mind me asking, what brand is yours. Any comment on the quality of the Astrosystems autocollimator.

Thanks
Richard